Rotary pump



E. DIFFINGER,

ROTARY PUMP Filed Jan. 30. 1924 2 Sheets-Sheet 1 Q QQ Q. w ya@ /./////////////`N//// &\

Feb; 16 1926.

- E. A. DIFFINGER TARY PUMP lFiled Jan. 30. 1924 2 Sheets-Sheet' 2 FINGER,

f ciency and the rotating Patented Feb. 16, 1926.

-,UNITED sT l 1 l ,1,573,683 ATESPATENT OFFICE.

FUGNF ARsNF DIFFINGER, oFV FAnIs, FRANCE, AssIGNon oF CNF-HALF To ETABLISSEMENTS I. COLOMBIER FILS, oF FAnIs, FRANCE.

ROTARY PUMP.

Application filed .'Ianuaryv 30, 1924. Serial No. 689,488.

To all whom t may concern:

Be it known I, EUGNE ARSNE 'DIF- a citizen of French Republic, residing at Paris, France, 86 Cours de Vincennes, have invented certain new and useful Improvements in Rotary Pumps, of which the following isa specification.

This invention relates to two ,improvements in rotary pumps, especially those hav.- ing floating blades. Y

Although these improvements are appl, cable to all rotary pump systems, they have been studied and will be described asy especially applicable to the compressor described in the application, for French patent lodged on the 26th of October, 1923, by E. A. Diffinger, No. 26,850, for rotary self regulating refrigerating group. In this' application are shown slots in' the rotor Aengaged by blades which are preferablyvinclined (that vis to say, not radial) towards 'the direction "of rotation. y

This arrangement is advantageous f/or small compressors but in large apparatus I preferably employ radial slots. The friction at the ends of the yblades against the cylinder wall is then greater and as on the other hand the centrifugal force is considerable, because of the weight and speed of the lrotating parts, it follows that all the'apparatus wears quicker and especially the cylinder wall.

According to the present invention, the balancing of the blades is obtained byl formmg tates with the blade between the extremity of each of the blades and the cylinder wall, and counteracts vthe centrifugall force by a resistance which can be regulated and thus the apparatus has a good mechanical efiiblades can, I,owing to the equilibrium obtained, play one upon the other, exactly as was foreseen in the specification previously .referred to.

The first object of the invention is illustrated in Figure 1, whichis anaxial section of the compressor, and Figures 2 and 3 are detailed constructions, Figure 3 being a seetion through -lw of Figure 2.

At the'end of a shaft 1 of a compressor is mounted an .Pllmp 501 exemple which forces the oil from ej separator, not s twoarms 4, 4, each of which opens beenfa-eompensator 5 and rotor 6 into an an oil cushion under pressure which roauxiliary oil pump 2, a rotary hown, into a pipe"3 which annular passage 7 7 which itself opens into the ooves 8, 8, formed in the ends of the bla es 9. In order that the oil mayI How towards the outer ends, each of the joined ribs 10, which form the blades, is chamfered at 11, to form a groove soas to'form, ]oetween the ribs, a system of small interstitial passages (Figures 2 and 3) which allows the oil to How in a radial direction as far as the .oil grooves 12, 12. These-latter are formed by cutting away supplied by the pump 2 as far as the grooves 12, 12', can equally be regulated so as to form and keep in these grooves, which rotate with theblades, a reservoir of oil under sufficient pressure to balance the centrifugal force. This balancing of the blades is reinforced by the reaction of the oil flowing in the ports 8, 8,'in theepipe 13. It may be observed hat in the application No. 26,850/23 there is provided a supply of oil under pres'- sure acting on the'rear face of the blades to press them on to. the cylinder, in which case the pressure of the coluinn of oil from the separator is sufficient. v-

In this type of compressor which is the subject of the present application, this pressure would on'the contrary be insufficient to assure the balancing of the blades, hence, the necessity for a pump which is an essential feature of the invention.

A second object is to ensure a uniform and permanent lubrication of "all the rotary parts. In order to obtain this, the circulation of oil is carried out precisely as shown in Figures 1 to 4, Figure 4 being an axial sectionvof a compressor.

A valve or a diaphragm 14 regulates the pressure of the oil as it enters from a tube 15 of a separator when forming part of a refrigerating group, to suit the side compensators 5 which bear against the ends of the blades. The maximum pressurenecessary for obtaining a seal and reducing the friction, is generally several kilograms.

The oil completely fills a chamber 16, and by a. passage 17 leading to the axis of the rotor, also fills a channel 18 formed in the rotor and communicating by the passage 17 with anotherr chamber 16 at the' end of the the ribs at the outer ends of the blades and over a length detenined by lexperiment. Thus the pressure of the oil compensator; owing to this arrangement all of the rotor, thence through a passage 20, which conducts it to the suction end of the compressor, whence it passes through the slots 21 in the rotor and is drawn in between the ribs and produces a perfect lubrication of all parts. On the other hand the o1l Y jointl thus formed makes a perfect seal and considerably diminishes the friction, and it must be understood that the application of these tWo improvements, Which have just been described, are not limited to rotary self regulating refrigerating groups, the subject of the former patent, but it can be applied to all systemsof rotary pumps having independent or other blades for use with gas or liquid. The improvements allow, in'

1. In a rotary pump, a cylinder, a rotor therein, and bla-des formed of a plurality of joined plates reduced` at their opposite ends -to provide channels extending to the outer edge of the blades, saidedge'being 'recessed at each end toV communicate with said chan-y nels. l

2. In a rotary pump, a cylinder, a rotor therein, freely mounted blades disposed Iin longitudinal seats in said rotor, compensators at oppositeends of said blades having oil passages therethrough communicating with, said blades, and a pump actuated by`V the rotor shaft and connected to maintain an `oil pressureabout said blades.

` 3. In a rotary pump, a cylinder, a rotoro therein, blades mounted in said rotor andl formed with Ia series of channels upontheir opposite ends communicating with an intersecting groove, and oil feed passages at opposite ends ofthe cylinder communicating with said groove.

4. In a rotary pump, a cylinder, a rotor therein having its shaft mounted in heads at opposite ends of the cylinder and provided with a central lubricating passage, independently movable bla-des disposed in seats extending longitudinally of the rotor, said blades being provided with oil passages at their opposite ends and upon the outer edge thereof, and compensators at the opposite ends of said rotor provided with oil passages communicating with the blade seats.

5. In a rotary pump, a cylinder, a rotor therein having its shaft mounted in heads at opposite ends of the cylinder and provided nvith a central lubricating passage, independently movable bla-des disposed in seats extending longitudinally of the rotor, said blades being provided with oil passages at their opposite ends and upon the outer edge thereof, compensators at the opposite ends of said rotor provided with oil passages communicating with the blade seats, a4 ro-- tary pump carried by the'shaft of said rotor, v and a conduit extending therefrom and communicating With the oil passages in the compensators.

EUGENE 'ARSENE DIEEINGER. 

